parabiotic

noun Biology.

1. experimental or natural union of two individuals with exchange of blood.
2. Physiology. the temporary loss of conductivity or excitability of a nerve cell.

noun

1. the natural union of two individuals, such as Siamese twins, so that they share a common circulation of the blood
2. a similar union induced for experimental or therapeutic purposes

n.

1. The fusion of whole eggs or embryos, as occurs in conjoined twins.
2. Surgical joining of the vascular systems of two organisms.